Weeds are becoming resistant to herbicides in the same way bacteria are becoming resistant to our anti-biotics. Due to over-use.
This is not a new issue, it was not created by genetic modification, and it will never go away. This is why the world is and always will be in a constant search of the next great pesticide/anti-biotic. It's simply evolution. Weeds evolve, bacteria evolve, and thus our technology will evolve.
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